Enhancing filtration performance with layered and bimodal nanofiber structures

Öz

Particulate matter (PM) must be removed from the air because it is a serious threat to human health. Micro and/or nanoporous nonwoven fabrics are commonly used to filter these particles. In our study, the filtration performances of nanofibrous mats, which were obtained by combining fibers produced by two different production methods in a layered and bimodal manner, were evaluated. Fibrous layers produced by the meltblown (MB) method were obtained with similar fiber diameters and different thicknesses by different feeding speeds. Bimodal structures obtained by adding fibers with an average diameter of 225 nanometers produced by the solution blowing (SB) method into fibers with an average diameter of around 800 nm obtained at 1, 5 and 10 rpm screw rotating/feeding speeds had higher filtration performance than the samples without SB nanofibers. Then, among the 4 samples with an average basis weight of 15 gsm, the sample MB only without (electro-blown nanofiber); the EB sample contains only EB nanofibers; the sample (L) containing 4 gsm EB nanofibers and the 4-layer sample (4L) containing 4 gsm EB nanofibers (138 nm) were compared. The 4L sample had the highest quality factor (0.0353) with a filtration efficiency of %96.01 and a pressure drop of 135 Pa. Although the filtration efficiency increased in all samples with the subsequent corona treatment, the highest value (99.34%) was obtained from the 4L sample.

Anahtar Kelimeler

• Bimodal
• Air Filter
• Meltblown
• Electro-Blowing
• Corona Discharge

Katmanlı ve bimodal nanolifli yapılarla filtrasyon performansının artırılması

Öz

Parçacık madde (PM), insan sağlığı için ciddi bir tehdit olduğu için havadan uzaklaştırılmalıdır. Bu partikülleri filtrelemek için genellikle mikro ve/veya nanoporlu dokusuz kumaşlar kullanılır. Çalışmamızda, iki farklı üretim yöntemiyle elde edilen liflerin katmanlı ve bimodal bir şekilde birleştirilerek oluşturulan nanolif matların filtreleme performansları değerlendirildi. Meltblown (MB) yöntemi ile üretilen lif tabakaları, benzer lif çaplarına sahip fakat farklı besleme hızlarıyla farklı kalınlıklara sahip olarak elde edildi. Çözelti üfleme (SB) yöntemi ile elde edilen 225 nanometre çapındaki ortalama lif eklenerek oluşturulan bimodal yapılar, 1, 5 ve 10 rpm vidalı dönme/besleme hızlarında elde edilen yaklaşık 800 nm çapındaki liflere göre daha yüksek filtreleme performansına sahipti. Ardından, 15 gsm ortalama taban ağırlığına sahip 4 örnek arasında; EB nanolif içermeyen sadece MB örnek; yalnızca EB nanolif içeren EB örneği; 4 gsm EB nanolif içeren (L) örnek ve 4 gsm EB nanolif içeren 4 katmanlı (4L) örnek karşılaştırıldı. 4L örneği, %96.01 filtreleme verimliliği ve 135 Pa basınç düşüşü ile en yüksek kalite faktörüne (0.0353) sahipti. Tüm örneklerde sonraki corona işlemiyle filtreleme verimliliği artmasına rağmen, en yüksek değer (%99.34) 4L örneğinden elde edildi.

Anahtar Kelimeler

• Eriyikten üfleme
• Bimodal
• Elektro-üfleme
• Hava filtresi
• Korona şarjı

Kaynakça

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